Four-Point Method of Roundness and Spindle Error Measurements – G.X. Zhang and R. K Wang

Abstract

A new method of roundness and spindle error motion measurement is presented in this
paper. Roundness error of the workpiece and radial error motion of the spindle are
measured simultaneously by using 4 probes mounted with certain angle arrangement. This
method gives high accuracy for all harmonics which is difficult for three point method. Based
on error analysis a methodology for selecting optimal parameters is given. Both computer
simulation and experiment justify the high accuracy of proposed method.